Packera glabella |
Packera obovata |
|
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butterweed |
roundleaf ragwort, running groundsel |
|
Habit | Annuals or biennials, 20–70+ cm; fibrous-rooted (caudices relatively short, weak). | Perennials, 20–50+ cm; stoloniferous and rhizomatous (rhizomes horizontal to suberect). |
Stems | 1 (striated, frequently hollow, often pink- to purple-tinged), glabrous or leaf axils sparsely tomentose. |
1 or multiple, loosely clustered, usually glabrous, sometimes tomentose proximally and in leaf axils. |
Basal leaves | (and proximal cauline) obscurely petiolate; blades obovate to oblanceolate, sometimes lyrate (lateral lobes to 5 pairs, terminal lobes larger than laterals), 50–150+ × 10–30+ mm, bases tapering, ultimate margins crenate to irregularly undulate. |
(and proximal cauline) petiolate; blades orbiculate, ovate, or obovate, 40–100+ × 20–80+ mm, bases tapering, rounded, or abruptly contracted, margins crenate, dentate, or serrate. |
Cauline leaves | gradually reduced (weakly clasping, similar to basal). |
gradually reduced (sessile, clasping; pinnatisect or sublyrate). |
Peduncles | bracteate, glabrous or bases tomentose. |
bracteate, glabrous or proximally tomentose. |
Ray florets | (8–)13; corolla laminae 7–9 mm. |
8–13(–21); corolla laminae 7–10 mm. |
Disc florets | 35–50+; corolla tubes 2.5–3.5 mm, limbs 2–3 mm. |
40–50+; corolla tubes 2–3 mm, limbs 2–3 mm. |
Phyllaries | (13–)21, green, 5–7 mm, glabrous. |
13 or 21, green (tips sometimes reddish), 3–6 mm, glabrous or floccose-tomentose proximally. |
Calyculi | conspicuous (bractlets 2.5–4 mm). |
conspicuous. |
Heads | 8–30+ in umbelliform or cymiform arrays (robust plants with multiple arrays). |
6–15+ in open or congested, corymbiform arrays. |
Cypselae | 1–1.5 mm, sparsely hirtellous on ribs or glabrous; pappi 3–4 mm. |
1–1.5 mm, glabrous or hirsute on ribs; pappi 3–6 mm. |
2n | = 46. |
= 44, 88, 90. |
Packera glabella |
Packera obovata |
|
Phenology | Flowering (Feb–)mid Mar–late May. | Flowering late Feb–Apr (south), early Apr–early Jun (north). |
Habitat | Open wet areas, edges of woodlands, stream banks, roadsides, meadows, marshes, fallow fields | Meadows in deciduous woodlands, wet ditches, stream banks, rocky hillsides |
Elevation | 0–600 m (0–2000 ft) | 0–2500 m (0–8200 ft) |
Distribution |
AL; AR; FL; GA; IL; IN; KS; KY; LA; MO; MS; NC; NE; OH; OK; SC; TN; TX
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AL; AR; CT; FL; GA; IL; IN; KS; KY; LA; MA; MD; MI; MO; MS; NC; NH; NJ; NM; NY; OH; OK; PA; RI; SC; TN; TX; VA; VT; WV; ON; QC; Mexico (Coahuila)
|
Discussion | Packera glabella is common and almost weedy in wet, partially shaded places. The hollow, striated stems of P. glabella are distinctive. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Packera obovata forms relatively large, stoloniferous colonies in wet sites. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 588. | FNA vol. 20, p. 594. |
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera |
Sibling taxa | ||
Synonyms | Senecio glabellus, Senecio carolinianus, Senecio densiflorus, Senecio lobatus, Senecio lyratus, Senecio mississipianus | Senecio obovatus, Senecio aureus var. obovatus, Senecio elliottii, Senecio elongatus, Senecio rotundus |
Name authority | (Poiret) C. Jeffrey: Kew Bull. 47: 101. (1992) | (Muhlenberg ex Willdenow) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981) |
Web links |